Hi, welcome to my list. Species are listed by state. Note that many species are in several states each.

• Alabama:
  
• Eastern fox squirrel (Sciurus niger)
• Eastern gray squirrel (Sciurus carolinensis)
• Eastern chipmunk (Tamias striatus)
• Southern flying squirrel (Glaucomys volans)
• Alaska:
  
• American Red Squirrel (Tamiasciurus hudsonicus)
• Arctic ground squirrel (Spermophilus parryi)
• Alaska marmot (Marmota broweri)
• Hoary marmot (Marmota caligata)
• Woodchuck (Marmota monax)
• Northern flying squirrel (Glaucomys sabrinus)
• Arizona:
  
• Gray-collared chipmunk (Tamias cinereicollis)
• Cliff chipmunk (Tamias dorsalis)
• Least chipmunk (Tamias minimus)
• Colorado chipmunk (Tamias quadrivittatus)
• Hopi chipmunk (Tamias rufus)
• Uinta chipmunk (Tamias umbrinus)
• Harris' antelope squirrel (Ammospermophilus harrisii)
• White-tailed antelope squirrel (Ammospermophilus leucurus)
• Golden-mantled ground squirrel (Spermophilus lateralis)
• Spotted ground squirrel (Spermophilus spilsoma)
• Round-tailed ground squirrel (Spermophilus tereticaudatus)
• Rock squirrel (Spermophilus variegatus)
• Gunnison's prairie dog (Cynomys gunnisoni)
• Black-tailed prairie dog (Cynomys ludovicianus)
• Tassel-eared squirrel (Sciurus aberti)
• Arizona gray squirrel (Sciurus arisonensis)
• Nayarit fox squirrel (Sciurus nayaritensis)
• Eastern fox squirrel (Sciurus niger)*
• American red squirrel (Tamiasciurus hudsonicus)
• Arkansas:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Eastern fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• California:
  
• Alpine chipmunk (Tamias alpinus)
• Yellow pine chipmunk (Tamias amoenus)
• Merriam's chipmunk (Tamias merriami)
• California chipmunk (Tamias obscurus)
• Yellow-cheeked chipmunk (Tamias ohrogenys)
• Panamint chipmunk (Tamias panamintinus)
• Long-eared chipmunk (Tamias quadrimaculatus)
• Allen's chipmunk (Tamias senex)
• Siskiyou chipmunk (Tamias siskiyou)
• Sonoma chipmunk (Tamias sonomae)
• Lodgepole chipmunk (Tamias speciosus)
• Uinta chipmunk (Tamias umbrinus)
• Yellow-bellied marmot (Marmota flaviventris)
• White-tailed antelope squirrel (Ammospermophilus leucurus)
• Nelson's antelope squirrel (Ammospermophilus nelsoni)
• California ground squirrel (Spermophilus beecheyi)
• Belding's ground squirrel (Spermophilus beldingi)
• Golden-mantled ground squirrel (Spermophilus lateralis)
• Mohave ground squirrel (Spermophilus mohavensis)
• Round-tailed ground squirrel (Spermophilus tereticaudatus)
• Townsend's ground squirrel (Spermophilus townsednii)
• Western gray squirrel (Sciurus griseus)
• Eastern gray squirrel (Sciurus carolinensis)*
• Fox squirrel (Sciurus niger)*
• Douglas' squirrel (Tamiasciurus douglasii)
• Northern flying squirrel (Glaucomys sabrinus)
• Colorado:
  
• Cliff chipmunk (Tamias dorsalis)
• Least chipmunk (Tamias minimus)
• Colorado chipmunk (Tamias quadrivittatus)
• Hopi chipmunk (Tamias rufus)
• Uinta chipmunk (Tamias umbrinus)
• Yellow-bellied marmot (Marmota flaviventris)
• White-tailed antelope squirrel (Ammospermophilus leucurus)
• Wyoming ground squirrel (Spermophilus elegans)
• Golden-mantled ground squirrel (Spermophilus lateralis)
• Spotted ground squirrel (Spermophilus spilsoma)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Rock squirrel (Spermophilus variegatus)
• Gunnison's prairie dog (Cynomys gunnisoni)
• White-tailed prairie dog (Cynomys leucurus)
• Black-tailed prairie dog (Cynomys ludovicianus)
• Tassel-eared squirrel (Sciurus aberti)
• Eastern fox squirrel (Sciurus niger)
• American red squirrel (Tamiasciurus hudsonicus)
• Connecticut:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• American red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Southern flying squirrel (Glaucomys volans)
• Delaware:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Delmarva fox squirrel (Sciurus niger cinereus)
• American red squirrel (Tamiasciurus hudsonicus)
• Southern flying squirrel (Glaucomys volans)
• Florida:
  
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Mexican red-bellied squirrel (Sciurus aureogaster)*
• Southern flying squirrel (Glaucomys volans)
• Georgia:
  
• Eastern chipmunk (Tamias striatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Hawaii:
  
• Sorry, Hawaii. No squirrels here. Check your local zoo.
• Idaho:
  
• Yellow-pine chipmunk (Tamias amoenus)
• Cliff chipmunk (Tamias dorsalis)
• Least chipmunk (Tamias minimus)
• Red-tailed chipmunk (Tamias ruficaudatus)
• Hoary marmot (Marmota caligata)
• Yellow-bellied marmot (Marmota flaviventris)
• White-tailed antelope squirrel (Ammospermophilus leucurus)
• Uinta ground squirrel (Spermophilus armatus)
• Belding's ground squirrel (Spermophilus beldingi)
• Idaho ground squirrel (Spermophilus brunneus)
• Columbian ground squirrel (Spermophilus columbianus)
• Wyoming ground squirrel (Spermophilus elegans)
• Golden-mantled ground squirrel (Spermophilus lateralis)
• Townsend's ground squirrel (Spermophilus townsendi)
• American red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Indiana:
  
• Eastern chipmunk (Tamias striatus)
• Franklin's ground squirrel (Spermophilus franklinii)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• American red squirrel (Tamiasciurus hudsonicus)
• Southern flying squirrel (Glaucomys volans)
• Iowa:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Franklin's ground squirrel (Spermophilus franklinii)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• American red squirrel (Tamiasciurus hudsonicus)
• Southern flying squirrel (Glaucomys volans)
• Kansas:
  
• Eastern chipmunk (Tamias striatus)
• Franklin's ground squirrel (Spermophilus franklinii)
• Spotted ground squirrel (Spermophilus spilsoma)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Black-tailed prairie dog (Cynomys ludovicianus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Kentucky:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Louisiana:
  
• Eastern chipmunk (Tamias striatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Maine:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Southern flying squirrel (Glaucomys volans)
• Maryland:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Southern flying squirrel (Glaucomys volans)
• Massachusetts:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Red squirrel (Tamiasciurus hudsonicus)
• Southern flying squirrel (Glaucomys volans)
• Northern flying squirrel (Glaucomys sabrinus)
• Michigan:
  
• Least chipmunk (Tamias minimus)
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Southern flying squirrel (Glaucomys volans)
• Minnesota:
  
• Least chipmunk (Tamias minimus)
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Franklin's ground squirrel (Spermophilus franklinii)
• Richardson's ground squirrel (Spermophilus richardsonii)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
• Southern flying squirrel (Glaucomys volans)
• Mississippi:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Missouri:
  
• Eastern chipmunk (Tamias striatus)
• Woodchuck (Marmota monax)
• Franklin's ground squirrel (Spermophilus franklinii)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Eastern gray squirrel (Sciurus carolinensis)
• Fox squirrel (Sciurus niger)
• Southern flying squirrel (Glaucomys volans)
• Montana:
  
• Yellow-pine chipmunk (Tamias amoenus)
• Least chipmunk (Tamias minimus)
• Red-tailed chipmunk (Tamias ruficaudatus)
• Hoary marmot (Marmota caligata)
• Yellow-bellied marmot (Marmota flaviventris)
• Uinta ground squirrel (Spermophilus armatus)
• Columbian ground squirrel (Spermophilus columbianus)
• Wyoming ground squirrel (Spermophilus elegans)
• Golden-mantled ground squirrel (Spermophilus lateralis)
• Richardson's ground squirrel (Spermophilus richardsonii)
• 13-lined ground squirrel (Spermophilus tridecemlineatus)
• Black-tailed prairie dog (Cynomys ludovicianus)
• Red squirrel (Tamiasciurus hudsonicus)
• Northern flying squirrel (Glaucomys sabrinus)
  

Click here for states starting with N to W.